How old do i have to be to be in the Goldman Sachs summer internship?

I'm looking forward on becoming an Analyst and working at Goldman Sachs. I want to be in the summer internship program to raise my chances. I've been accepted to University of Michigan-Ann Arbor.. I'm currently in my summer vacation right now and going to college soon. What do i do?? I need help and advice? Is it a good idea to work at Goldman Sachs?